{
  "manageEntity": {
    "action": "Save",
    "entityId": "475410913",
    "entityType": "Track",
    "nonce": "0x1aba901b57cdad4fae9c737b4a562f7932f06c5e217beffbed2429523ab73eab",
    "signature": "0x3fbbf465816cff19bf129bc47734b787dd7ea8d10e1001698ffd3a0dfb196d8854292f4c13752b4dd1553a4e17a6fe98e14460580b9afd626ebafc1afdf33af61c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}